The Zox retro old school is a lightweight, narrow profile half helmet that keeps a vintage style but brings new school technology with it. This DOT approved motorcycle helmet also features a narrow low profile EPS liner to help absorb impacts and disperse the energy instead of staying in one central location.; AFCS advanced fiberglass composite shell for your safety 2 shell sizes to ensure good fit XS-S, M-2XL EPS liner system for narrower profile shell DOT approved